No Element Has a tabindex Attribute Greater Than 0

Overview

The tabindex attribute makes elements keyboard navigable.
Positive values indicate an explicit navigation ordering of elements.
Although this is valid, in practice it is extremely hard to do correctly and
creates unusable experiences for users who rely on assistive technologies.

Recommendations

Below the audit, Lighthouse displays something like 1 element fails
this test. The number varies depending on how many elements are failing.
Click this label to expand the list. You can find each element in your
DOM by running the $(), $$(), and $x() functions
from the Chrome DevTools Console.

Set the tabindex of each of these elements to either -1, for elements
that should not be keyboard navigable, or 0, for elements that should. If
you need an element to appear earlier in the tab order, consider moving
it earlier in the DOM.